Cineversity

Hello I try to bake some particles with dynamics and text as a obj sequences
I can’t figure out how to bake the particles as a keyframes sequences

**I have include the files

Hi Gregg,

As usual, what is the target or the original idea? It sounds this is in the middle of a problem and not the start, so any answer will have less chance to get solved.

(Not files available in your post)

Perhaps there is a better way to do it. Particles to MoGraph and cache it first. Perhaps Alembic?

Single Particle as Keyframes? As they are “born” and “die” there is a point of non existence which can’t be natively key framed on a single particle base.

Baking particles have found some plug in developers love. Perhaps there is a solution!?
(E.g.,  http://aescripts.com/tp-partio/  http://nitro4d.com/blog/donationware/nitrobake/)
I haven’t used any of these, though. I think in Alembic lays the future.

I will check the standard (but which is not the native!) way for obj sequence export…

All the best

Sassi

Hey Gregg,

I have researched a little bit. With a little trick I got the standard particle to create obj sequences. (Which will work similarly with TP. You hadn’t specified it so far)

I used “Riptide” for it. It is a plug in that write obj sequences. I placed a 1x1cm polygon under the “Emitter” and set it to Show Object. The “Emitter” itself under a “Connect” object.

To my knowledge (http://en.wikipedia.org/wiki/Wavefront_.obj_file) obj can’t contain particles, hence the workaround.

If the scene is on frame zero, with no particles—not polygon, Riptide wont work, it checks the scene if there is a polygon. So press play and stop to make the app happy. Then export—see attachment.

Funnily enough it wont read this sequence back in. But that was not your question, right. Testing a single file, it merges, and in that way I was able to see that the obj has the polygons stored. Which made me curios: Deleting the empty obj (frame zero) and it worked with Riptide. Which means, I loaded the sequence in, and of course played with it. The result in the second file (CV2_r14_drs_13_objs_01.zip), and the source file from which I had exported the sequence is as well included (CV2_r14_drs_13_objs_00.zip).

To be president, I think Alembic should be tried as well, as that is for model export, what ACES is for color, perhaps soon the industry standards. Which I have both initially suggested to integrate in C4D.

I hope that helps.

All the best

Sassi

Hey Sassi,

I have came up with your solution using Alembic, and it works great,
I have also use Riptide for exporting my final obj sequences.
When I was trying to export all my simulation with riptide it didn’t work but as you say the first frame as 0 polys, tahnks for this tip
I have figure out a work around ....
This is the step I have follow

1) I have made my standard particles emitter with exemple a cube ( add a dynamics tags on the cube to make it fall for exemple)
2) I bake the particles emitter using the bake tag
3) I have cache the simulation of the dynamics
4) export all my sequence with alembic
5) import the abc file in a new project
6) export my abc sequence with Riptide

et voilà .. after this point I have a perfect obj sequence.
thanks again for your precious knowledge

cheers !
GS

Hey Gregg,

Sounds very usable! You got your OBJ sequence - that is great news! Yes Alembic has quite some potential.

I didn’t had your scene-file or an example/proxy of it, otherwise I would have loved to test this of course.

If you need more ideas for other ways to bake things, I have discussed this quite a lot in the NLA (non linear animation) for teams tutorial series.

There are other ways with Python, as I learned it a while ago, to transfer keys via Python, but not so much for particles directly.

Anyway, you have done it, got the project running, perfect.

I wish you nice Holidays

Sassi